<template>
 <h1>app</h1>
 <breadCrumb :data="data"></breadCrumb>
<router-view></router-view>
</template>
<script setup>
import {ref,getCurrentInstance,onMounted} from 'vue'
let data=ref([])
onMounted(()=>{
    let instance=getCurrentInstance() //获取组件实例
    //获取app全局添加的属性
    let $bus=instance.appContext.config.globalProperties.$bus;
    $bus.$on('breadChange',input=>{
        // console.log(input)
        data.value=input;
    })
})
</script>

